Bicycle driving mechanism.



y Patented ren, u, |902. J. BAKER. j I

No. 693,2l4.

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l AUNITED STATES PATENT OFFICE.

JAMES BAKER, OF MELBOURNE, VICTORIA, AUSTRALIA,

BICYCLE DRIVING MECHANISIVI.

SPECIFICATION forming part of Letters Patent No. 693,214, dated February 1 1, 1902.

v Application filed July 9, 1901l To all whom t may concern;

Beit known that I, JAMES BAKER, a subject of King Edward VII, King of the United Kingdom of Great Britain and Ireland, residing at 237 Dryburgh street, Melbourne, in the State of Victoria, Australia, have invented certain new and useful Improvements in Bicycle Driving Mechanism; and I do hereby declare the following to be a full, clear,.and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and' use the same.

The objectof this invention is to provide improvements in bicycles or other velocipedes in which the weight of therider upon the saddlefurnishespart of the drivingpower. There have been different inventions for this pur-` pose; but this invention comprises important features of a novel character, avoiding complication and undue weight, providing useful adjustability, and being easily iitted to or removed from an ordinary bicycle.

The saddle in this invention is not hinged to its support, so as to rock, nor is it on slides, so as to move horizontally. Its motion is elliptical and will be understood from the construction next described. I Referring to the accompanying drawings, in which the scale is about half natural size, except Figures 3 and 4, which are about onel sixth actual size, Figs. l and 3 are side views of the upper and lower parts, respectively, of a bicycle-frame fitted according to this invention. Figs. 2 and 4 are respective fron-t elevations of the parts in Figs. l and 3. Fig. 5 shows in perspective the roller-bearin g guideframe for the forked saddle-support. Fig. 6

is a side view of the clip for securing the said guide-frame to the upper backbone of an ordinary bicycle, and Fig. 7 shows another arrangement in side view wherein the clip is connected to aladys cycle having no upper backbone.

The ordinary frame of the bicycle is marked a, the crank-axle b, (passing through the bottom bracket a', Fig. 3,) and the saddle c, (on springs or the like d.) The pedalcranks are e andf, the former in its ordinary position. v

g is a clip on the cycle-frame, which it is (in any suitable manner) made to grip tightly. It has lugs h, between or to which are suitably connected, as by bolts 7c, earsj, Fig. 5,

. tical plane. to suit 'the rider by adjusting the position of serial N0. 67,649. (No modem 0r earj, Fig. 7, of a frame z', usually made in two parts united together. Frame t has a pair of parallel rollers I and another pair of l through the said frame. These members have suitable means for the connection of the saddle thereto, as grooves q. v

The fork is at the top of a rod 79, which operates a special crank s. The lower end of rod p is connected to the crank-pin t, Fig. 3, which projects from the outer end of the spocial crank s, the inner endV of which is journaled on the crank-axle h.

To the pin t at the outer end of the crank s is rigidly connected the inner end of crank f. Oranks e andf are not ou the same axis, nor is crankf (on one side of rod p) in line with crank s, (on lthe other side of said rod,)

` "but,'as seen in Fig. 3, at an angle thereto, so

that there will be no dead-center, the turn-y ing or down thrust on crank s by the utilization of the riders weight being most powerfnl when or about when the pedal thrust is least effective.

' The riders weight on saddle c depresses rod and forces cranks around in the direction shown bythe arrow in Fig. Then crank s points vertically downward, its next half-l By means of the fork the saddle is kept cen-l tral over the frame a, while the rollers Z m minimize friction and limit oscillatory movement of the saddle. The more or less oblique up-and-down movement takes place in a ver- The obliqueness may be varied clip g. Any Well-known means of varying the height of the saddle from the pedals may be employed, if desired.

IOO

Vhat I claim as my invention, and desire to secure by Letters Patent of the United States, is-

1. In a cycle of the class indicated, the combination with the frame thereof, and driving mechanism therefor; of a guide-frame having two pairs of roller-bearings at right angles to one another, a clip for holding said guideframe in position, ears for secu ring said frame to said clip, a rod passing through said guide-frame, a saddle upon said rod, and means connecting said rod to the driving mechanism, substantially as described.

2. In a cycle of the class indicated, a rod having a fork at its upper end, a saddle snpported on said fork, and means for guiding said fork; of a crank-shaft having a pedal on one end and a crank s on the other end to which the said rod is pivoted, and a pedalcrank connected to the cranks, substantially as described.

3. In a cycle of the class indicated, the combination with the frame thereof; of a guidefrainc having two pairs of roller-bearings at right angles to one another, a clip for holding said guide-frame in position, a rod having a fork at the upper end, said fork passing through said guide-frame, a saddle supported upon said fork, and a crank to Which said rod is connected, substantially as described.

et. In a cycle of the class indicated, the combination with the frame thereof; of a guideframe having two pairs of roller-bearings at right angles to one another, a clip for holding said guide-frame in position, a rod having a fork at the upper end, said fork passing through said guide-frame, a saddle supported upon said fork, a crank-shaft having apedalcrank at one end and a crank s on the other end to which the said rod is pivoted, and a pedal-crank connected yto said crank s, substantially as described.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

JAMES BAKER. Vitnesses:

. M. LOWE, G. G. TURRI. 

